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U.S.P.H.S. Survey, Cincinnati Municipal Garage, Automobile Brake Servicing Operation, Cincinnati, Ohio, Report No. IHS-32-11.
NIOSH 1972 Mar:3 pages
A municipal garage operating an automobile brake servicing shop (SIC- 7539) was investigated for airborne contamination of asbestos (1332214), lead (7439921) and copper (7440508) dusts. Air samples were collected during working hours and analyzed for asbestos fibers by means of X-ray diffraction and optical microscopy. Lead and copper dust were collected from the brake drum containing 6 and 0.5 percent of the metals by weight and concentrations determined by an atomic absorption spectrophotometer. Samples were taken during blowing off operations of the front and rear drums, from the general air during the blowing off operations, during reassembly of the brakes, and from the general air during reassembly operations. Very little asbestos was found in the samples. The highest concentration occurred during blowing off of the rear drum with an average of 2.55 fibers per 5 milliliters (fibers/5ml) of air and lowest during reassembly with an average of 0.2fibers/5ml of air. Asbestos concentrations during blowing off of front drums was about 54 percent of that found during the rear operations, for an average of 1.4fibers/5ml of air. Air samples from the front and rear blowing off areas contained 4.7 and 2.34 milligrams per cubic meter (mg/m3) of lead and 0.26 and 0.52mg/m3 of copper, respectively, while the general air during these blow off operations contained 0.55 and concentrations were within what are considered maximum allowable concentration, but all samples showed rather high lead contents. The author suggests that some method of wheel and back plate cleaning be used to eliminate lead from working atmospheres in automobile brake servicing shops.
NIOSH-Author; NIOSH-Survey; Field-study; Air-sampling; Carcinogens; Poisons; Safety-research; Employee-exposure; Air-quality-control; Region-5; IHS-32-11; Field-Study;
1332-21-4; 7439-92-1; 7440-50-8;
NTIS Accession No.
Division of Field Studies and Clinical Investigation, NIOSH, Cincinnati, Ohio, Report No. IHS-32-11, NTIS PB83-188-045, 3 pages
Page last reviewed: November 6, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division